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On a day Mitt Romney and President Barack Obama were facing off for their first presidential debate, "The Daily Show" host Jon Stewart was brushing up on his own debate skills in preparation for a showdown this weekend with political commentator Bill O'Reilly. Stephen Colbert was on hand to give Stewart a few helpful pointers.

Stewart and O'Reilly will take the stage at George Washington University Saturday in a political debate called "The Rumble in the Air-Conditioned Auditorium."

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Making a dramatic entrance on a wheeled podium pulled by two muscular men, Colbert assumed the role of a larger-than-life conservative pundit and gave Stewart some tips right off the bat.

“Jon, you’ve already made your first mistake,” Colbert said. “You allowed me to make a bigger entrance than you.”

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Launching into a debate about American exceptionalism, Colbert jumped at the opportunity to plug his new book, “America Again: Re-becoming the Greatness We Never Weren’t,” which was praised by Stewart.